shell script skipping EOF when boot - shell

Question

I added some shell scripts changing some contents of file in /etc/init.d directory.
#!/bin/bash
set -x
DBMS_ID='testuser'
DBMS_PW1='*****'
CONFIG_EXEC="./some_program"
${CONFIG_EXEC} config <<EOF
yes
127.0.0.1
${DBMS_ID}
${DBMS_PW1}
yes
EOF
cp -f A.txt B.txt
so I expected result below
DB configuration...
HOST : 127.0.0.1
USER : testuser
PASS : ********
PORT : 3306
DB : mysql
UNIX_SOCKET : /tmp/mysql.sock
TESTING CONFIGURATION ...
[ERROR] - Mysql connect error[1045] : Access denied for user 'testuser'#'127.0.0.1' (using password: YES)
Do you want to setup database. [yes/no] : HOST : USER : PASS :
PORT (Default: 3306) : DB (Default: mysql) : UNIX_SOCKET (Default: /var/lib/mysql/mysql.sock) :
TESTING CONFIGURATION ...
[OK]
Done.
+ cp -f A.txt B.txt
but I got some error when reboot
DB configuration...
HOST : 127.0.0.1
USER : testuser
PASS : ********
PORT : 3306
DB : mysql
UNIX_SOCKET : /var/lib/mysql/mysql.sock
TESTING CONFIGURATION ...
[OK]
Do you want to setup database. [yes/no] : HOST : USER : + cp -f A.txt B.txt
some content in EOF block skipped.
why this problem happened?
and How can i fix it?

Answer 1

I found why this happened.
My program (some_program in question) is made with C++, and it uses the tcgetattr function to hide the input password.
On boot, this function leads to the error below, so it looks like skipping. Actually, the problem is caused by this program.
Inappropriate ioctl for device
So it is a different problem with shell.
If someone suffered this problem, or a similar situation, check if some program or script uses tcgetattr or stream-related functions.